Machine for making paper cones



3 Sheets-Sheet 2 Oct. 30, 1928.

C. K. DUNLAP MACHINE FOR MAKING PAPER corms 3 Sheets-Sheet 3 C. K.DUNLAP MACHINE FOR MAKING PAPER. GONES Flled Nov. 1, 1926 Oct. 30,19.28.

low cost.

Patented Oct. 30, 1928.

UNITED STATES PATENT OFFICE.

CHARLES K. DUNLAP, 0F. HARTSVILLE, SOUTH CAROLINA, ASSIGNOR TO SONOCOPROD- UC'IS COMPANY, OF HARTSVILLE, SOUTH CAROLINA, A CORPORATION OFSOUTH CAROLINA.

MACHINE FOR MAKING PAPER CONES.

Application filed November 1, 1926. Serial No. 145,608.

The present invention relates to machines for making paper tubes orcones, and particularly to machines for making paper cones such as areused in large numbers in the textile industries.

The purpose of the invention, generally stated, is to provide atube orcone making machine having a number of novel features of constructionwhereby articles of this class may be made quickly, accurately, and atIn the manufacture of the well known truncated paper cone it isdesirable to use blanks having tapered or deckle edges so that neitherthe inner nor the outer surface of the'resulting cone will be marred bya projecting edge, which edge is un de sirable for a number of reasons.By usmg a deckle edge blank paper cones may be made having both innerand outer surfaces which are truly circular in transverse section. Themanufacture of cones from deckle edged blanks involves a difficulty notpresent in the manufacture of cones from blanks having no deckle edges,thls difficulty being in securing the forward edge of the blank tothe'mandrel prior to the winding operation, it having been foundimpracticable to merely insert the edge of the blank in a shallow-slotin the mandrel as is possible in the manufacture of cones not havingdeckle edges.

In the patent to G. H. Kennedy, No.

- 1,482,849, a mandrel is disclosed by means of which deckle edged conesmaybe satisfactorily manufactured and in my Patent No. 1,528,248 anothertype of mandrel is suggested by which this may be done. The presentinvention provides a mandrel of the general type disclosed in these twoprior patents in that it is adapted to wind blanks having deckle edgesquickly .into cones but it embodies certain features of construction notfound in these or other prior cone wind-' ing devices. It will beunderstood that after the cone is wound both ends thereof are trued by atrimming operation, spaced trimming knives descending and bearingagainst the cone while it is still on the rotating mandrel, a portion ofthe nose of the cone and a portion of the base being removed so that thetop and bottom edges are truly circular and are disposed inparallelplanes normal to the knives cannot reach it. The mandrel of the conewinding machine which I have now devised and will hereinafter describeis so. designed that the movement of trimming it presents asubstantially solid surface snugly fitting the inside of the freshlywound v cone so that the trimming operation may be carried out quicklyand with the certainty of completely parting the portions to be trimmedoff from the body of the cone. A mandrel of this type presents theadvantage that the trimming knives may be adjusted to cut at any desiredpoint along the length of the mandrel and need not be sitioned only atpredetermined points. A. urther advantage of the machine consists in thefact that the mandrel provides means for. ositively forcing the innerdeckle edge 0 the cone against the next convolution thereof afterwinding so that this edge firmly adheres thereto. A still further advante consists in the fact that the mandrel may made to collapse if desired,that is, the bearing area of the cone on the mandrel may be decreasedprior to the time of removal of the cone from, the mandrel so that suchremoval may be easily effected. A

Other novel features and advantages of my improved mechanism will becomeapparent to those skilled in the art as it is disclosed in the followingdetailed description taken with the accompanying drawings. It will berealized that one embodiment only of the invention is set forth by wayof exam 1e but that the invention is not limited to t is exactdisclosure since the design and arshown in Figure 1, a paper blank beinmillustrated as it appears when engaged by the mandrel just prior to awinding operation;

Figure 3 is an end view of the machine as viewed from the left of Figure1;

Figure 4 is avsection on line 44 of Figure 1; Y

Figure 5 is an axial section thru the mandrel and its operating spindle;

Figures 6, 7, 8, 9 and 10 are sections thru the mandrel on the line AAof Figure 1 parts being shown in different relative positions for-thepurpose of illustrating a sequence of operations; a

Figure 11 is an axial section thru the mandrel showing its relativelyremovable parts in a different relationship from that in which the areshown in Figure 5; and

igure 12 is a side elevation of a modified form of mandrel partly brokenaway.

A portion of the frame of the machine is indicated at 10, this framebeing preferably of steel or cast iron and of conventional type, itsessential function being to provide a support for the mandrel, thecutting knives and the operating mechanisms for these instrumentalitiesas well as to provide a support for the, blank feeding and pastingmechanism, and other essential portions of a tube or core windingmachine, but which are omitted from the drawings for the sake ofclearness. The mandrel itself is indicated generally at M, this mandrelbeing conical in form and substantially hollow as can-be seen fromFigure 5. It comprisesthe major portion 11 and the minor portion 12, theminor portion 12 constituting merely a triangular section of the conicalside wall of the major portion. Portion 11 has its larger end secured toan annular block 13 which is interiorly threaded and has threaded engagement with one end of a hollow spindle 14 mounted in bearings 15supported on pedestal 16 secured to the table 10. The minor portion 12is attached to the end of an arm 17 integral with or detachabl securedto a solid rod or spindle 18 whic extends thru the bore of thecylindrical spindle 14. By sliding spindle 18 to'theleft (Figure 5)relatively to the coaxial spindle 14 the mlnor portion 12 of the mandrelmay be, in fact, drawn inwardly so that its conical outer surface liesinside of the conical inside surface of the major portion of themandrel. This posit-ion is shown in Figure 11 and also in Figures 8 and9. After the parts have assumed the relative positions shown in Figure11 spindle 18 may be rotated carryinv portion 12 of the mandrel with it.Two

adgacent edges 11" and 12' of the two relatively movable portions of themandrel are spaced apart for the reception of the edge of a segmentalpaper blank B shown in Figure 2. This blank may be fed into the mandreleither longitudinally thereof, laterally,

after to be described in the direction of the arrow C until the blankhas been completely wound thereon, about three turns of the mandrelbeing necessary to complete this winding operation. The smaller portion12 of the mandrel is then retracted as shown in Figure 8 and is movedaround circumferentially inside of the larger portion in the directionof the arrow 1) (Figure 9) to contact with the flap, which is stillsubstantially radially disposed within the mandrel. Continuing itsrotation it bends this flap into substantial parallelism with theadjacent inner wall of the-cone and finally is moved outwardly until itscylindrical outer surface is again in original or normal position,pressing the flap firmly against the inner wall of the cone andpresenting again a conical mandrel having a substantially solid unbrokensurface. The mandrel is still rotating and at this point the circularcutting knives 19 are moved downwardly tocontact with the cone andrigidly sever a small portion'from the nose of the cone and a small'frustro-conical portion from the base. These knives are then lifted anda mandrel stripping mechanism of common type removes the cone and itssevered end portions from the mandrel, after which the operation may berepeated. The operating mechanism for carrying out the above sequence ofoperation will now be described.

It will be seen from Figure 5 that the inner spindle 18 projects beyondthe cylindrical outer spindle 14. Spindle 14 is provided' with the slot20 in its end into which a pin 21 extending radially from spindle 18normally projects so that the two spindles may be only simultaneouslyrotated. Each spindle is provided with an operating pinion, spindle 14having pinion 22 keyed thereon and spindle 18 having pinion 23 rotatablymounted thereon but connected thereto by means of a helical spring24'one end of which is fastened in the pinion and the other end of whichis fastened in shaft 18. Meshing With pinion 23 is a large gear wheel 25mounted on a shaft 26 and meshing with pinion 22 is a gear wheel 27 alsomounted on shaft 26. Shaft 26 is rotated from a shaft 28 by intermeshingears 29 and 30, gear 29 being fixed on shaft 28 and gear 30 fixed onshaft 26. Shaft 28 is driven from the power shaft is constantly rotatingit will 1 a be seen that because of the intermittent gears 34 and 35 theshaft 31, and hence the mandrel, will be only intermittently operated.'During the periods of inaction the finished cone is removed and a freshblank fed thereto and during the periods of mandrel rotation the windingof the blank and the trimming of the cone takes place. The diameters ofgears 23, 25, 22 and 27 are so proportioned that pinion 23 is rotatedslightly faster than pinion 22. For instance the gearing may be sodesigned that for every ten revolutions of pinion 22 pinion 2-3 willcomplete eleven revolutions, thus winding up the spring 24. During theten revolutions of pinion 22 the blank will have been wound on themandrel into the form of a cone. At this period in the operation of themachine the cam 40, mounted upon shaft 33 strikes the down turned end 41of the reciprocable rod 42 moving the same toward the left (Figure 1)against the tensionof spring 43. Rod 42 has an upwardly extending endportion 44 provided with a forked end 45 the two spaced portions of thisfork lying in an annular groove formed in an annular collar 46 se curedupon the end of the inner spindle 18. Movement of the rod 42 to the lefttherefore under the influence of cam 40 results in correspondingmovement in the same direction of the inner spindle 18 and finally thepin 21 disengages the slot 20. As before explained the spring 24 hasbeen tensioned during the preceding rotations of the mandrel and whenpin 21 disengages slot 20 it becomes active to rotate spindle 18 thru360 whereupon the pin 21 again enters slot 20 and this movement stops.movement of spindle 18 axially and in rotating thru 360 the minorportion 12 of the mandrel is retracted and rotated in the mannerhereinbefore described and as shown in Figures 8, 9, 10 and 11, portion12 resuming its normal position when pin 21 is again fully seated inslot 20. This sequence of operations occurs as the blank is wound, the

action being entirely automatic and requiring no thought on the part ofan attendant. In Fi re 1 it will be seen that a second cam 50 is sopositioned as to intermittently.

engage and actuate the end 41 of sliding rod 42. This cam is not as highas cam 40 and does not effect the disengagement of pin 21 from slot 20.It does, however, result in axial movement of the innerspindle 18 tosome extent so that the cylindrical surface of the minor portion 12 ofthe mandrel is withdrawn out of contact with the cone which has beenwound thereon. The action of cam 50 is timed so that this movement ofportion 12 of the mandrel occurs only after the completion of thewinding of the cone and the purpose of this arrangement is to decreasethe bearing areaof the cone on the mandrel while the stripping mechanismis course results in the withdrawal of the During the acting to removethe cone from the mandrel. Decreasing of this contact area of coursemakes the stripping operation easier. The mandrel may therefore be saidto be c01- lapsible.

The knives 19 may be operated by any convenient form of mechanism. Asshown they are mounted upon spaced arms 52 secured upon a rock shaft 53.This rock shaft is urged by spring 54 to rotate in a direction 7:-tending to move the knives toward the mandrel. Such movement isprevented however except at proper times by an arm 55 extending radiallyfrom rock shaft 53 and having a laterally turned lower end 56 which liesin the path of a cam 57. It is only when cam 57 disengages arm 56 thatthe spring is effective to press the knives against the mandrel.Continued rotation of the cam of knives.

It may be desired to have more than one small portion of the mandrelmovable relatively to the larger portion. In Figure 12 a modified formof mandrel is dis closed having' two portions 112 which may be withdrawnwithin the larger portion 111 and rotated as in the case of the singleportion 12. By increasing the area of that portion of the mandrel whichmay be withdrawnout of contact with the cone the bearing area of thecone on the mandrel is decreased and it may be removed therefrom by thestripping apparatus with even greater ease.v

Obviously at the instant of completion of the cone the mandrel presentsa substantially unbroken surface and no portion of the cone lies beneaththis surface and out of reach of the cutting knives. The cutting knivesmay be adjusted .along the mandrel to cut at any zone and short or longcones turned out. as desired. This has not been possible heretofore withcone windingmandrels of known types.

The mandrel shown and described is pri-' marily designed to receiveblanks presented axially, or substantially axially, thereto. The blanksmag be fed however, in any other manner and y any suitable mechanism, 11minor changes being made in the construction of the mandrel ifnecessary, so that the v blanks may be freely received.

While I have described the invention as applied to a machine forwindingcones, and this is thepreferred embodiment thereof,it will be realizedthat without substantial modification it may be likewise employed inwinding cylindrical tubes. It is not-intended to limit the claimstherefore to a cone winding machine and hence the term conical as usedin the claims as describing the surface of the mandrel should beinterpreted as including cylindrical mandrels as well. Obviously manychanges may be made in 139 Inn and mechanism for effecting relativeaxial movement of said spindles.

2. A substantially hollow conical mandrel comprising two relativelymovable portions the outer surfaces of which normally define the conicalmandrel surface, and means ,for retracting one of said portions withinthe other, giving it a circumferential movement relatively to the other,and replacing the same in normal position.

3. A substantially hollow conical mandrel comprising two relativelymovable portions the outer surfaces of whichinormally define the conicalmandrel surface, and means for retracting one of said-portions withinthe other, giving it a circumferential movement relatively to the other,and replacing the same in normal position, said means including coaxialspindles, one secured to each mandrel portion.-

4. A mandrel for winding paper cones and the like comprising essentiallytwo portions the outer surfaces of which, taken together, normally forma substantially complete surface of revolution, two adjacent edges ofsuch portion being spaced apart to provide a slot for the introductionof the end of a paper blank, and means for retract ing one of saidportions within the other after a winding operation, effecting theirrelative rotation in such direction as to cause the inner member tocontact with and swing the inwardly projecting end of the paper sheettoward the inner wall of the paper cone 4 just formed, and restoring theretracted member to normal position thereby pressing the said end of'thepaper blank into close contact with the said inner wall.

5. A mandrel for winding paper cones and the like comprising a hollowconical member or shell having an aperture in its wall thrpugh which theleading end of a paper blank ma be projected, and a second member whicnormally rotates with the first member or shell but which may be rotatedrelatively thereto and within the same after 7.-'A mandrel for windingpaper cones and the like comprising a hollow shell the surface of whichcomprises portion of a surface of revolution and is adapted to supportthe greater portion of the area of the inner wall of a cone Woundthereon, the

outer surface of the second member completing, when normally positioned,the conical surface of revolutlon save for an aperture through which theblank end projects, but being adapted to be withdrawn within the firstmember and revolve relatively thereto in such direction as to swing.outwardly the inwardly projecting portion of the blank and thereafter tobe advanced to press the same against the body of the cone.

8. A mandrel for Winding paper cones and the like comprising a hollowconical member or shell through which the leadin end of a paper blankmay be projected, and a second member the outer surface of whichnormally completes the incomplete cone of revolution comprising thesurface of the first member.

9. A mandrel for winding paper cones and the like comprising a hollowconical, member the outer surface of which comprises the major portionof a surface of revolution, and a second member the outer surface ofwhich normally substantially completes the said surface of revolution,said members having spaced edges forming a slot through which theleading edge of a aper blank may be projected into the interior of themandrel, said members being axially movable relatively to each other androtatable relatively to each other after having been axially displaced,for the purpose set forth.

10. A mandrel for winding paper cones and the like comprising a hollowconical member the outer surface of which comprises the major portion ofa surface of revolution, and a second member the outer surface of whichnormally substantially completes the said surface of revolution, saidmembers having spaced edges forming a slot through which the leadingedge of a paper blank may be projected into the interior of the mandrel,the second member being retractable into the interior of the first andrevoluble relatively to the first after being so retracted, for thepurpose set forth.

member the outer surface of which comprises the major portion ofasurface of revolution, and a second member the outer surface of whichnormally substantially completes the said surface of revolution, saidmembers having spaced edges forming a stot through which the leadingedge of a paper blank may be projected into the interior of the mandrel,said members being mounted respectively on co-axially arranged spindlesand means being )rovided for automatically sliding said spind lesrelatively to each other in an axial direction, rotating them relativelyto each other, and again sliding them relatively to original position.

12. A mandrel for winding paper cones and the like comprising a hollowconical member the outer surface of which comprises the major portion ofa surface of,revolution, and a second member the outer surface of whichnormally substantially completes the said surface of revolution, saidmembers having spaced edges forming a slot through which the leadingedge of a paper blank may be projected into the interior of the mandrel,said members being mounted on co-axially arranged spindles, and saidspindles having interengaging means normally constraining them to rotatetogether,

disengagement being effected by relative axial movement of the spindles.

13. A mandrel for winding aper cones and the like comprising a hoLowconical member the outer surface of which comprises the major portion ofa surface of revolution. and a second member the outer surface of whichnormally substantially completes the said surface of revolution, saidmembers having spaced edges forming a slot through which the leadingedge of a paper blank may be brojected into the interior of the mandrel,said members being mounted on co-axially arranged spindles whichnormally have a pin and slot engagement with each other, thusconstraining the spindles to rotate together, disenga ement of the pinand slot connection being brought about by relative axial movement ofthe spindles.

14. The method of winding cones and the like from a blank sheet ofmaterial coated with paste comprising securing the blank to a rotatablemandrel with its leading edge below the surface of the mandrel, rotatingthe mandrel to wind the cone and thereafter pressing the leading edge'of the blank outwardly into contact with the inner wall of the cone tocause the same to adhere thereto.

In testimony whereof I hereunto aflix my signature.

' CHARLES K. DUNLAP.

